Five and one-half decades have now passed since a young President John F. Kennedy rallied a nation behind a bold challenge to send an American to the Moon and safely back before the end of that decade. We did this, and even better — putting four of our citizens on the lunar surface and returning them by 1969, plus delivered two more into lunar orbit who returned with them. Within three more years, eight others had walked on the Moon on successful round-trip voyages, along with four more orbital companions. An invitation to write an article about the Apollo legacy for [...]